Grindstone-fixture.



No. 763,469. PATENTEDJUNE 28, 1904.

T. P. ELLIS. GRINDSTONE FIXTURE.

APPLIOMI'ION FILED DBO. 10, 1903.

N0 MODEL.

, A5 a Z4 26 Attorney Patented June 28, 19 04.

PATENT OFFICE.

THOMAS PATRICK ELLIS, OF RIPIJEY, TENNESSEE.

GRlNDSTONE-FIXTURE.

SPECIFICATION forming part of Letters Patent No. 763,469, dated une 28, 1904:.

Application filed December 10, 1903- Serial No. 184,625. (No model.) 4

To all whom it may concern/.-

Be it known that I, THOMAS PATRICK ELLIS, a citizen of the United States, residing at Ripley, in the county of Lauderdale and State of Tennessee, have invented certain new and useful Improvements in Grindstone- Fixtures; and I do declare the following to be a full, clear, and exact description of. the invention, such as willenable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in grindstone fixtures or supports.

The object of the invention is to provide a fixture or mounting for a grindstone, whereby the same may be quickly fixed on a crankshaft and mounted on the supporting horse or trestle. 7

A further object is to provide means for ad.- justing and centering the stone on the shaft and which will firmly hold the stone in place and cause the same to run true at all times.

WVith these and other objects in view the invention consists of certain novel features of construction, combination, and arrangement of parts, as will be more'fully described, and particularly pointed out in the appended claims.

In the accompanying drawings, Figure 1 is a central vertical section through a portion of a grindstone on a line with the crank-shaft, showing the application of the device. Fig. 2 is a-similar view taken between the arms of the spider. Fig. 3 is a detail side elevation of the stone, showing one side of the fixture in place and the crank-shaft in section. Fig. 4 is a similar view of the opposite side of the stone. Fig. 5 is a detail sectional view through the crank-shaft, showing one of the ball-bearings for the same.

Referring to the drawings more particularly, 1 denotes a grindstone, 2 denotes the supporting trestleor horse, and 3 denotes thecrank-shaft, the ends of which are journaled in ball-bearings 4, fixed on the trestle. On one end of the shaft 3 is formed a crank 55, to which may be connected a pitman-rod, (not shown,) through which the shaft may be turned by foot-power. On its opposite end the shaft is squared for the reception of the usual hand-crank. (Not shown.)

- Adjacent to the bearings 4 the shaft is provided with stop-collars 6, which are held in place on the shaft by set-screws. The stopcollars abut against the bearingsand hold the shaft in place.

On the shaft at one side of the stone is arranged a spider-plate 7, consisting of a central hub 8 and four radial right-angularlydisposed arms 9, provided at their upper ends with outwardly-projecting right-angular ears or lugs 10, in which are formed openings 11.

In the rear side of the hub'8 and arms 9 are formed four radial right-angularly-disposed slots 12, the outer ends of which open through the sides of the hub, as sho'wnat 12.

In the openings 11 of the lugs 10 are arranged the outer ends of hook-bolts 13, on which are screwed nuts 14. The inner ends of the bolts pass through the slot-openings 12 and are provided with squared right-angularly-bent ends forming hooks 15, which are adapted'to project through the slots 12 and to engage thewalls or sides of the square opening 16, which is usually formed in grindstones and through which the crank-shaft passes.

The outer face of the hub 8 is concaved or has formed therein a shallow socket 8. On the shaft 3, adjacent to this end of the hub, is mountedacollar 17, which is held in place on the shaft by a set-screw 18. The inner end of thecollar 17 is rounded or convex, as shown at 19. This rounded or convex end of the collar17 is adapted to fit within the concaved end 8 of the hub and forms aball-and-socket joint with spider-plate 7 and hub 8.

The walls of the shaft-opening in the hub 8 are conical in shape and flare outwardly from toward the inner end of the hub, as clearly shown at 20 in Figs. 1 and 2 of the drawings, thereby permitting the hub, spiderplate, and the stone carried thereby to have a tilting movement in any direction on the rounded end of the collar 17 to facilitate the adjustment and truing up of the stone to cause the same' to run evenly.

On the shaft 3, adjacent to the opposite side of the stone, is arranged a spider or clampingplate 21, which consists of a hub 22, having three or more radially-disposed arms 23, in

the ends of which are arranged set screws 24:. The inner ends of said screws are pointed and adapted to bore into the side of the stone slightly when engaged therewith, and thereby more firmly hold the same in place. A setscrew 25 is passed through the hub of the plate or spider 21 and engages the shaft 3 to hold the plate in place. 7

In mounting a stone on the shaft the collar 17 is first placed thereon and secured by the set screw 18. The spider 7 is then placed on the shaft against the collar 17. The stone is now placed on the shaft and the hooked ends of the bolts 13 are engaged with the walls of the opening 16 and the nuts 14 screwed up, thereby drawing the hooked ends of said bolts into tight engagement with the walls of the opening 16, and thus centering and firmly supporting the stone. is now arranged on the shaft in close proximity to the opposite side of the stone. The setscrew 25 in the hub of this plate is now tightened against the shaft to hold the plate in position. The set-screws 24 in the ends of the arms 23 are now screwed into the stone, thereby firmly clamping the same against the plate on the spider 7 and securely holding the stone against slipping.

After the parts have been thus assembled should the stone be found to run unevenly or untrue the set-screws 24 in the arms of the spider or clamping-plate 21 are turned to adjust the stone and the supporting-spider 7 on the shaft 3 and against the rounded end of the collar 8 to cause said stone to run evenly and concentrically with the shaft, thereby preventing undue strain on any of the parts and permitting tools to be evenly ground on the stone and causing the stone to be evenly and squarely Worn away.

The ball-bearing connection of the shaft 3 with the supporting-trestle will permit the stone to be freely and easily turned.

From the foregoing description, taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion, and the minor details of construction may be resorted to without departing from the prin- The clamping-plate 21 ciple orv sacrificing any of the advantages of this invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a grindstone-fixture, the combination with a suitably-mounted drive-shaft, of a contrally-apertured grindstone supported thereby, a spider-plate secured to the shaft, said spider-plate consisting of a central hub mounted on said shaft, radial slotted arms carried by said hub, ears or lugs formed on said arms, hook-bolts adjustably connected to said lugs, right-angularlydisposed hooks formed on said bolts to work through said slotted arms and to engage the walls of the central aperture in said stone, and a clamping-plate secured on said shaft adjacent to the opposite side of said stone, adjustable means arranged on said clamping-plate to engage and prevent the. slipping of said stone and to clamp the same firmly against the centering-spider, substantially as described.

2. .In a grindstone-fixture, the combination with a suitably-mounted drive-shaft having antifriction-bearings, of a centrally-apertured grindstone supported thereby, a spider-plate secured to the shaft, said spider-plate consisting of a central hub mounted on said shaft, radial slotted arms carried by said hub, ears or lugs formed on said arms, hook-bolts adjustably connected to said lugs, right-angularly-disposed hooks formed on said bolts to work through said slotted arms and to engage the walls of the central aperture in said stone, a clamping-plate secured on said shaft adjacent to the opposite side of said stone, said clamping-plate consisting of a hub adjustably secured on said shaft, radial arms secured to said hub, and set-screws arranged in the ends of said arms to engage and hold said stone against slipping and to clamp the same firmly against said centering-spider, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

THOMAS PATRICK ELLIS. WVitnesses:

(J. I MCKINNEY, A. F. Soccer. 

